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DESIGN AND ANALYSIS OF AN H-TYPE EARTHQUAKE
RESISTING BUILDING USING ISOLATION TECHNIQUE
BY STAAD PRO
1S.Rajkumar, 2P.kumaran,
1Professor, Department of Civil Engineering, Global institute of engineering& technology,Melvisharam,
Vellore.India.
2PG Student of Structural Engineering, Department of Civil Engineering, Global institute of engineering&
technology, Melvisharam, Vellore.India.
ABSTRACT
In order to complete in the ever growing competent market it is very important for a structural engineer to
save time. As a sequel to this an attempt is made to analyze and design an earthquake resisting building by
using a software package STAAD pro. For analyzing a multi storied building one has to consider all the
possible loadings and see that the structure is safe against all possible loading conditions and possible loading
conditions due to earthquake. There are several methods for analysis of different frames like kani’s method,
cantilever method, portal method, and Matrix method. The present project deals with the analysis of an
earthquake resisting building using isolation technique. The isolation is providing in between foundation to
column base. The dead load &live loads are applied and the design for beams, columns, footing is obtained.
In isolation dampers is hydraulic, fluid, viscos, and rubber are used. So in this project rubber dampers are
used in isolation technique. STAAD Pro with its new features surpassed its predecessors, and compotators
with its data sharing capabilities with other major software like AutoCAD, and MS Excel. We conclude that
staad pro is a very powerful tool which can save much time and is very accurate in Designs. Thus it is
concluded that staad pro package is suitable for the design of an earthquake resisting building.
Keywords: Earthquake resisting building, Isolation technique, STAAD Pro,Design and Analysis.
1. INTRODUCTION
In every aspect of human civilization we needed structures to live in or to get what we need. But it is
not only building structures but to build efficient structures so that it can fulfill the main purpose for
what it was made for. Here comes the role of civil engineering and more precisely the role of analysis
of structure. are many classical methods to solve design problem, and with time new software’s also
coming into play. Here in this project work based on software named staad pro has been used. Few standard
problems also have been solved to show how staad pro can be used in different cases. These typical problems
have been solved using basic concept of loading, analysis, condition as per IS code. These basic
techniques may be found useful for further analysis of problems.
1.2. SPECIFICATIONS
The specifications are provided for the construction “H TYPEEARTHQUAKE RESISTING BUILDING”.
The provision is made in thespecifications are as follows.
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1.2.1. SUB SOIL DATA
The sub soil is of course grade and compacted sand. The plate load test was conducted by the P.W.D
authorizes to determine the SBC value.
1.2.2. ORIENTATION
The H type earthquake resisting building is proposed to be constructed atdeanery. This proposed land is
owned by the private it faces south.
1.2.3. BRICK MASONARY
The most and widely used material for construction of building is brick. Ithas the following advantages.
i) Raw materials required are ordinary earth which is available isabundance.
ii) Kill burning bricks are used
iii) Locally available brick size 19 x 9 x 9 cm all the works will be in brick masonry in cement mortar 1:6
using abovemaintained bricks. The height of wall from floor level to roof level is 3m this brick are obtained
from Arni town the sand is obtained from Cheyyar River.
1.2.4. CONCRETE
Concrete is a material obtained by combining together interest material like sand gravel and broken stone.
This R.C.C is weak in tension and strong incompression so steel reinforcement is used to take up the tensile
stress in thisproject the R.C.C for the ratio of 1:2:4 using 20mm nominal metals are obtained from Arni. All
the R.C.C works are going to be done by volume batching.
1.2.5. ROOFING
The roofing will be of R.C.C M20 grade with 150 mm thick and it isdesigned as two way slab & one way
slab.
1.2.6. COLUMN AND FOOTING
The column is of the size 0.35X 0.25 .1m center. The footings are the size of2.5 x 1.5 with 0.3m wide.
1.2.7. FLOORING
This will be of R.C.C 1:2:4 150 mm thick using 40mm nominal size HBGmetal over the wall compacted
river sand cushion which is 150 mm thick the top ofthe floor is finished with mosaic slabs polished.
1.2.8. DAMP PROOF COURSE
The damp proofing of a building is achieved by using a suitable material this should satisfy the following
requirement.
i) It should be imperious to moisture
ii)It should be stable in loaded and unloaded condition.
iii) It should not be distributed by the effect of dead load coming over the surface
iv)Damp proofing properly should remain constant with lapse of time inthis project the CM of 3 cm is used as
DPC.
1.2.9. DOORS AND WINDOWS:-
The primary purpose of doors is serving as a means of communication from one room to another room.
Secondly in combination with windows providescircular ventilators.
1.2.10. PLASTERING:-
Plastering for the ceiling is in CM 1:3, plastering for walls if 1:5 with 5 cm curing is done locally available
portable water.
1.2.11. WHITE WASHING:-
White washing is done by using white cement over the plastered surface ofinternal walls to improve its
appearance.
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1.2.12. WEATHERING COURSE:-
This will be in brick jelly works with lime of 40% and over which that tiles are laid in oiled mortar required
slope may be maintained.
1.2.13. COLOUR WASHING:-
The color wash is applied in one or the more coats over the first coat ofwhite wash 5% of gum is added to the
solution. The application is similar.
1.2.14. STEEL:-
This steel used in the design of the R.C.C member is Fe 415.
1.3. BASE ISOLATION
Base isolation, or the method of decoupling a structure from its base, and in effect from the horizontal
motion produced by an earthquake. In a base isolation system, the horizontal stiffness is low enough to
prevent the ground motion from being transmitted to the structure. Elastomeric base isolation systems
are proven to be effective in reducing seismic forces transmitted to buildings.
Fig 1 Base isolation
Fig 2 Without base isolation
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2. MATERIAL PROPERTIY
2.1. Physical Properties of Cement
Ordinary Portland cement, 53Grade conforming to IS: 269 – 1976.Ordinary Portland cement, 53Grade
was used for casting all the Specimens. Different types of cement have different water requirements to
produce pastes of standard consistence. Different types of cement also will produce concrete have a different
rates of strength development. The choice of brand and type of cement is the most important to produce a
good quality of concrete. The type of cement affects the rate of hydration, so that the strengths at early ages
can be considerably influenced by the particular cement used. It is also important to ensure compatibility of
the chemical and mineral admixtures with cement.
2.1.1 Specific Gravity
The density bottle was used to determine the specific gravity of cement. The bottle was cleaned and
dried. The weight of empty bottle with brass cap and washerW1 was taken. Then bottle was filled by 200 to
400g of dry cement and weighed as W2.The bottle was filled with kerosene and stirred thoroughly for
removing the entrapped air which was weighed as W3.It was emptied, cleaned well, filled with kerosene and
weighed as W4.
2.1.2 Fineness (By Sieve Analysis)
The fineness of cement has an important bearing on the rate of hydration and hence on the rate of gain of
strength and also on the rate of evolution of heat. Finer cement offers a greater surface area for hydration and
hence faster development of strength. 100 grams of cement was taken on a standard IS Sieve No.9 (90
microns). The air-set lumps in the sample were broken with fingers. The sample was continuously sieved
giving circular and vertical motion for 15 minutes. The residue left on the sieve was weighed.
2.1.3 Consistency
The objective of conducting this test is to find out the amount of water to be added to the cement to get a
paste of normal consistency. 500 grams of cement was taken and made into a paste with a weighed quantity of
water (% by weight of cement) for the first trial. The paste was prepared in a standard manner and filled into
the vicatmould plunger, 10mm diameter, 50mm long and was attached and brought down to touch the surface
of the paste in the test block and quickly released allowing it to sink into the paste by its own weight. The
depth of penetration of the plunger was noted. Similarly trials were conducted with higher water cement ratios
till such time the plunger penetrates for a depth of 33-35mm from the top. That particular percentage of water
which allows the plunger to penetrate only to a depth of 33-35mm from the top is known as the percentage of
water required to produce a cement paste of standard consistency.
2.1.4 Initial Setting Time
The needle of the Vicat apparatus was lowed gently and brought in contact with the surface of the test
block and quickly released. It was allowed to penetrate into the test block. In the beginning, the needle
completely pierced through the test block. But after sometime when the paste starts losing its plasticity, the
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needle penetrated only to a depth of 33-35mm from the top. The period elapsing between the time when water
is added to the cement and the time at which the needle penetrates the test block to a depth equal to 33-35mm
from the top was taken as the initial setting time.
2.2 Property of Fine Aggregate
Clean and dry river sand available locally will be used. Sand passing through IS 4.75mm Sieve will be
used for casting all the specimens.
2.2.1 Absorption, Porosity, and Permeability
The internal pore characteristics are very important properties of aggregates. The size, the number, and
the continuity of the pores through an aggregate particle may affect the strength of the aggregate, abrasion
resistance, surface texture, specific gravity, bonding capabilities, and resistance to freezing and thawing
action. Absorption relates to the particle's ability to take in a liquid. Porosity is a ratio of the volume of the
pores to the total volume of the particle. Permeability refers to the particle's ability to allow liquids to pass
through. If the rock pores are not connected, a rock may have high porosity and low permeability.
2.2.2 Surface Texture
Surface texture is the pattern and the relative roughness or smoothness of the aggregate particle. Surface
texture plays a big role in developing the bond between an aggregate particle and a cementing material. A
rough surface texture gives the cementing material something to grip, producing a stronger bond, and thus
creating a stronger hot mix asphalt or portland cement concrete. Surface texture also affects the workability of
hot mix asphalt, the asphalt requirements of hot mix asphalt, and the water requirements of portland cement
concrete. Some aggregates may initially have good surface texture, but may polish smooth later under traffic.
These aggregates are unacceptable for final wearing surfaces. Limestone usually falls into this category.
2.2.3 Strength and Elasticity
Strength is a measure of the ability of an aggregate particle to stand up to pulling or crushing forces.
Elasticity measures the "stretch" in a particle. High strength and elasticity are desirable in aggregate base and
surface courses. These qualities minimize the rate of disintegration and maximize the stability of the
compacted material. The best results for Portland cement concrete may be obtained by compromising between
high and low strength, and elasticity. This permits volumetric changes to take place more uniformly
throughout the concrete.
2.2.4 Hardness
The hardness of the minerals that make up the aggregate particles and the firmness with which the
individual grains are cemented or interlocked control the resistance of the aggregate to abrasion and
degradation. Soft aggregate particles are composed of minerals with a low degree of hardness. Weak particles
have poor cementation. Neither type is acceptable. The Mohs Hardness Scale is frequently used for
determination of mineral hardness.
2.3 Property of Coarse Aggregate
Crushed granite aggregate with specific gravity of 2.77 and passing through 4.75 mm sieve and will be
used for casting all specimens. Several investigations concluded that maximum size of coarse aggregate
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should be restricted in strength of the composite. In addition to cement paste – aggregate ratio, aggregate type
has a great influence on concrete dimensional stability. 20mm down size aggregate was used.
2.3.1 Specific Gravity
A pycnometer was used to find out the specific gravity of coarse aggregate. The empty dry pycnometer
was weighed and taken as W1. Then the pycnometer is filled with 2/3 of coarse aggregate and it was weighed
as W2. Then the pycnometer was filled with part of coarse aggregate and water and it weighed as W3. The
pycnometer was filled up to the top of the bottle with water and weighed it as W4.
2.3.2 Bulk Density
Bulk density is the weight of a material in a given volume. It is expressed in Kg/m3.A cylindrical
measure of nominal diameter 250mm and height 300mm was used. The cylinder has the capacity of 1.5 liters
with the thickness of 4mm. The cylindrical measure was filled about 1/3 each time with thoroughly mixed
aggregate and tampered with 25 strokes. The measure was carefully struck off level using tamping rod as
straight edge. The net weight of aggregate in the measure was determined. Bulk density was calculated as
follows.
Bulk density = (Net weight of coarse aggregate in Kg)/ (Volume)
2.3.3 Surface Moisture
100g of coarse aggregate was taken and their weight was determined, say W1. The sample was then kept
in the oven for 24 hours. It was then taken out and the dry weight is determined, says W2. The difference
between W1 and W2 gives the surface moisture of the sample.
2.3.4 Water Absorption
100g of nominal coarse aggregate was taken and their weight was determined, say W1. The sample was
then immersed in water for 24 hours. It was then taken out, drained and its weight was determined, says W2.
The difference between W1 and W2 gives the water absorption of the sample.
2.3.5 Fineness Modulus
The sample was brought to an air-dry condition by drying at room temperature. The required quantity of
the sample was taken (3Kg). Sieving was done for 10 minutes. The material retained on each sieve after
shaking, represents the fraction of the aggregate coarser then the sieve considered and finer than the sieve
above. The weight of aggregate retained in each sieve was measured and converted to a total sample.
3. PREPARATION OF SPECIMENS
The concrete is casted in to cube moulds of size 100mm×100mm,beam moulds of size 100×100×500mm
and cylindrical moulds of 200 mm height×150 mm dia. The moulds used for the purpose are fabricated with
steel seat. It is easy for assembling and removal of the mould specimen without damage. Moulds are provided
with base plates, having smooth to support. The mould is filled without leakage .In assembling the moulds for
use joints between the section of the mould are applied with a thin coat mould oil and similar coating of
mould oil is applied between the contact faces of mould and the base plate to ensure that no water escape
during filling .The interior surfaces of the assembled mould shall be thinly coated with mould oil to prevent
adhesion of concrete.
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Fig 2 Moulds
4.1 PLACING OF MIX IN MOULDS
After mixing the proportions in the mixing machine, it is taken out into the bucket. The concrete is
placed in to the moulds (cubes, beams & cylinders), which are already oiled simply by means of hands only.
Fig 3 -Mixing of concrete
Fig 4 -Placing of mix in moulds
5. HAREDENED CONCRETE TESTS
5.1COMPRESSIVE STRENGTH
The cubes were tested in the compression testing after proper curing. The failure load obtained from C.T.M.
machine and the results are tabulated below. The values for 3 types of mixes were calculated as follows.
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Formula used = (p x 1000)/(150 x150) N/mm2
Where p = failure load (from dial gauge of C.T.M.) in Kn
Compressive strength reading for conventional concrete (3days)
Table no. 5.1.1.1 Average compressive strength = 7.9N/mm2
Compressive strength reading for conventional concrete(7days)
S.NO Description Specimen1 Specimen2 Specimen3
1 Concrete mix designation M20 M20 M20
2 Curing time (days) 7 7 7
3 C/S area of specimens(mm) 150 × 150 150 × 150 150 × 150
4 Breaking load 320KN 340KN 360KN
5 Compressive strength, (N/mm2) 14.2 15.11 16
Table no. 5.1.1.2 Average compressive strength = 15.11N/mm2
Compressive strength reading for conventional concrete(28days)
S.NO Description Specimen1 Specimen2 Specimen3
1 Concrete mix designation M20 M20 M20
2 Curingtime (days) 28 28 28
3 C/Sareaofspecimens
(mm)
150 × 150 150 × 150 150 × 150
4 Breaking load 650KN 630KN 610KN
5 Compressive strength, (N/mm2) 28.88 28.0 27.11
Table no. 5.1.1.3 Average compressive strength = 27.97N/mm2
S.NO Description Specimen1 Specimen2 Specimen3
1 Concrete mix designation M20 M20 M20
2 Curing time (days) 3 3 3
3 C/S area of specimens(mm) 150 × 150 150 × 150 150 × 150
4 Breaking load 180KN 200KN 160KN
5 Compressive strength, (N/mm2) 8.00 8.88 7.11
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Fig. 5- C.T.M. Test Fig. Fig 6 - C.T.M. cube failure
5.2 TENSILE STRENGTH
The Cylinders were tested in the compression testing machine after curing and the results are tabulated
below. Four cylinders with M20 MIX proportion were casted and after curing the specimens were tested.
The size of cylinder is 150 mm dia and 300 mm height.
Formula used:
Tensile strength = (2 x p) / (3.14 x l x d)
Where,
P = Failure load (Kn)
L = ht. of cylinder
D = Dia of cylinder
Fig. 7 Tensile Test at 7 Day
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Fig. 8 Failure pattern
SL.
NO SPECIMEN
HEIGHT
(L)
mm
DIA
(D)
mm
LOAD AT
FAILURE
(P in kN)
TENSILE STRENGTH
(N/mm2)
STRENGTH
CYL
1
CYL
2
CYL
1
CYL
2 AVG
1 conventional
concrete (7 days) 300 150 120 132 1.70 1.87 1.78
2 conventional
concrete(28 days) 300 150 316 328 4.47 4.64 4.56
Table 5.2.1 -Tensile strength using spilt tensile test
Fig 9- Standard Beam
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FLEXURAL STRENGTH VALUES
SL.NO SPECIMEN BEAM SIZES(cm) LOAD a fb
L B D in Kg in Kn cm Kg/cm2
1 conventional
concrete (7 days) 60 20 15 3658 36.58 18 43.90
1
conventional
concrete (28
days)
60 20 15 4300 43 20 57.33
Table.5.3.1Flexural strength
STAAD.PRO ANALYSIS
2D view 3D view
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BENDING MOMENT DIAGRAM
SHEAR FORCEDIAGRAM
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CONCLUSION
The necessary drawing for reinforcement details was prepared using AutoCAD software. Designing
using Software’s like Staad reduces lot of time in design work. Details of each and every member can
be obtained using staad pro.All the List of failed beams can be obtained and also Better Section is
given by the software.Accuracy is improved by using software.By doing this project to draw and
prepare for a “DESIGN AND ANALYSIS OF H-TYPE EARTHQUAKE RESISTANCE BUILDING
USING ISOLATION TECHNIQUE BY STAAD PRO SOFTWARE” we also now have a rough idea
about the various books available in design of R.C.C members.The design was done by the following
the provisions of IS 456:2000, IS 875: PART-III; SP-16.
REFERENCES:
1. R. I. Skinner* and g. H. Mcverry ,bulletin of the new zealand society for earthquake
engineering, vol.8, n0.2. June 1975.
2. S.Keerthana, K. Sathish Kumar,K. Balamonica, Seismic Response Reduction of Structures
using Base Isolation.International Journal of Innovative Science, Engineering & Technology,
Vol. 2 Issue 2, February 2015.
3. Varghese, P.C., “Limit State Design of Reinforced concrete”, prentice Hall of India. Pvt. Ltd.,
New Delhi 2002.
4. Krishna Raju, N., “Design of Reinforced concrete structures”, CBS publishers& distributors,
New Delhi 2003.
5. Jain, A.K., “Design of Reinforced concrete structures”, Nemchand publication, Rourkee.
6. Sinha, S.N., “Reinforced concrete design”, Tata McGraw-Hill publishing Company Ltd., New
Delhi.
7. Theory of Structures by ramamrutham for literature review on kani,s method
8. Theory of structures by B.C.punmia for literature on moment distribution method.
9. IS 456:2000 codes of practice for plain and R.C.C design. IS 875:part-III; SP-16.IS 1893(Part
1) : 2002 Criteria For Earthquake Resistant Design Of Structures.
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